Explanation:

- Option 1: Ghar

- "Ghar" means house in Hindi. Commonly used to refer to a household, but it is not specific to Kodavas.

- Option 2: Biradari

- "Biradari" means brotherhood or community. It is used in North India to signify a fraternity, not a family unit among Kodavas.

- Option 3: Chulah

- "Chulah" refers to the traditional stove or hearth in a family, used symbolically in some cultures, but not for Kodavas’ family unit.

- Option 4: Okka

- "Okka" is the traditional joint family or clan system among Kodavas, unique to their culture. It's an extended family that shares common ancestry and property.